{"id":41736,"date":"2018-01-09T15:50:31","date_gmt":"2018-01-09T06:50:31","guid":{"rendered":"https:\/\/www.sejuku.net\/blog\/?p=41736"},"modified":"2024-05-06T11:45:46","modified_gmt":"2024-05-06T02:45:46","slug":"%e3%80%90c%e5%85%a5%e9%96%80%e3%80%91indexof%e3%81%a7%e6%96%87%e5%ad%97%e5%88%97%e3%82%84list%e3%80%81%e9%85%8d%e5%88%97%e3%82%92%e6%a4%9c%e7%b4%a2%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.sejuku.net\/blog\/41736","title":{"rendered":"\u3010C#\u5165\u9580\u3011IndexOf\u3067\u6587\u5b57\u5217\u3084List\u3001\u914d\u5217\u3092\u691c\u7d22\u3059\u308b\u65b9\u6cd5"},"content":{"rendered":"<p>IndexOf\u3063\u3066\u4f7f\u3063\u3066\u3044\u307e\u3059\u304b\uff1fC#\u3067\u306f\u6587\u5b57\u5217\u3084\u914d\u5217\u3001List\u304b\u3089<b>\u6307\u5b9a\u3057\u305f\u5bfe\u8c61\u3092\u691c\u7d22\u3057\u3001\u305d\u306e\u4f4d\u7f6e\u3092\u53d6\u5f97<\/b>\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001IndexOf\u306b\u3064\u3044\u3066<\/p>\n<div class=\"box01\">\n<ul>\n<li><b>IndexOf\u30e1\u30bd\u30c3\u30c9\u3068\u306f<\/b><\/li>\n<li><b>\u6587\u5b57\u5217\u5185\u306e\u6587\u5b57\u3092\u691c\u7d22<\/b><\/li>\n<li><b>List\u306e\u8981\u7d20\u3092\u691c\u7d22<\/b><\/li>\n<li><b>\u914d\u5217\u306e\u8981\u7d20\u3092\u691c\u7d22<\/b><\/li>\n<li><b>\u6587\u5b57\u5217\u5185\u306e\u8907\u6570\u306e\u8a72\u5f53\u7b87\u6240\u3092\u691c\u7d22<\/b><\/li>\n<li><b>\u5f8c\u308d\u304b\u3089\u306e\u691c\u7d22<\/b><\/li>\n<li><b>\u6b63\u898f\u8868\u73fe\u3092\u4f7f\u3063\u305f\u691c\u7d22<\/b><\/li>\n<\/ul>\n<\/div>\n<p>\u306a\u3069\u5fdc\u7528\u7684\u306a\u5185\u5bb9\u306b\u3064\u3044\u3066\u3082\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002\u4eca\u56de\u306fIndexOf\u306b\u3064\u3044\u3066\u3001\u4f7f\u3044\u65b9\u3092\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3057\u307e\u3059\uff01<\/p>\n<h2>IndexOf\u30e1\u30bd\u30c3\u30c9\u3068\u306f<\/h2>\n<p>IndexOf\u30e1\u30bd\u30c3\u30c9\u306f\u6587\u5b57\u5217\u5185\u306b\u542b\u307e\u308c\u308b\u6587\u5b57\u3001\u6587\u5b57\u5217\u306e\u4f4d\u7f6e\u3092\u53d6\u5f97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u307e\u305f\u3001List\u3084\u914d\u5217\u306b\u542b\u307e\u308c\u308b\u8981\u7d20\u306e<b>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u756a\u53f7\u3092\u53d6\u5f97<\/b>\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n<p><b>String\u30af\u30e9\u30b9\u3084List\u30af\u30e9\u30b9\u3001Array\u30af\u30e9\u30b9<\/b>\u306a\u3069\u305d\u308c\u305e\u308c\u306e\u30af\u30e9\u30b9\u3067IndexOf\u30e1\u30bd\u30c3\u30c9\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u305d\u308c\u305e\u308c\u306e\u30af\u30e9\u30b9\u306eIndexOf\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\uff01<\/p>\n<h2>\u6587\u5b57\u5217\u5185\u306e\u6587\u5b57\u3092\u691c\u7d22<\/h2>\n<p>\u307e\u305a\u306f\u6587\u5b57\u5217\u5185\u306e\u6587\u5b57\u3082\u3057\u304f\u306f\u6587\u5b57\u5217\u3092\u691c\u7d22\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u307f\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002IndexOf\u30e1\u30bd\u30c3\u30c9\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">public int IndexOf(\r\n    string value\r\n)<\/pre>\n<p>\u5f15\u6570value\u306f\u691c\u7d22\u3059\u308b\u6587\u5b57\u3082\u3057\u304f\u306f\u6587\u5b57\u5217\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002\u6307\u5b9a\u3057\u305f\u6587\u5b57\u3001\u6587\u5b57\u5217\u304c\u898b\u3064\u304b\u3063\u305f\u5834\u5408\u306f\u30010\u304b\u3089\u59cb\u307e\u308b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u756a\u53f7\u3092\u8fd4\u3057\u307e\u3059\u3002\u898b\u3064\u304b\u3089\u306a\u304b\u3063\u305f\u5834\u5408\u306f-1\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n<p>\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u78ba\u8a8d\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"lang:c# decode:true \">using System;\r\n\r\nnamespace Sample\r\n{\r\n  class Sample\r\n  {\r\n    static void Main()\r\n    {\r\n      string str = \"Hello World!\";\r\n      string target = \"l\";\r\n      \r\n      int num = str.IndexOf(target) + 1;\r\n      \r\n      if(num &gt; 0) {\r\n        Console.WriteLine(\"{0}\u306f{1}\u756a\u76ee\u306b\u3042\u308a\u307e\u3059\", target, num);  \r\n      } else {\r\n        Console.WriteLine(\"{0}\u306f\u898b\u3064\u304b\u308a\u307e\u305b\u3093\u3067\u3057\u305f\", target);\r\n      }\r\n      \r\n      Console.ReadKey();\r\n    }\r\n  }\r\n}<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">l\u306f3\u756a\u76ee\u306b\u3042\u308a\u307e\u3059<\/pre>\n<p>\u3053\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u306f\u3001IndexOf\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u3066&#8221;l&#8221;\u3092\u691c\u7d22\u3057\u3001\u305d\u306e\u4f4d\u7f6e\u3092\u53d6\u5f97\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<h2>List\u306e\u8981\u7d20\u3092\u691c\u7d22<\/h2>\n<p>List\u306e\u8981\u7d20\u3092\u691c\u7d22\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u3082\u307f\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002IndexOf\u30e1\u30bd\u30c3\u30c9\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">public int IndexOf(\r\n    T item\r\n)<\/pre>\n<p>\u5f15\u6570item\u306f\u691c\u7d22\u3059\u308b\u8981\u7d20\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002\u6307\u5b9a\u3057\u305f\u8981\u7d20\u304c\u898b\u3064\u304b\u3063\u305f\u5834\u5408\u306f\u30010\u304b\u3089\u59cb\u307e\u308b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u756a\u53f7\u3092\u8fd4\u3057\u307e\u3059\u3002\u898b\u3064\u304b\u3089\u306a\u304b\u3063\u305f\u5834\u5408\u306f-1\u3092\u8fd4\u3057\u307e\u3059\u3002\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u78ba\u8a8d\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"lang:c# decode:true \">using System;\r\nusing System.Collections.Generic;\r\n\r\nnamespace Sample\r\n{\r\n  class Sample\r\n  {\r\n    static void Main()\r\n    {\r\n      string[] src = {\"Tokyo\", \"Osaka\", \"Nagoya\"};\r\n      var list = new List&lt;string&gt;();\r\n      list.AddRange(src);\r\n      string item = \"Osaka\";\r\n      \r\n      int num = list.IndexOf(item) + 1;\r\n      \r\n      if(num &gt; 0) {\r\n        Console.WriteLine(\"{0}\u306f{1}\u756a\u76ee\u306b\u3042\u308a\u307e\u3059\", item, num);  \r\n      } else {\r\n        Console.WriteLine(\"{0}\u306f\u898b\u3064\u304b\u308a\u307e\u305b\u3093\u3067\u3057\u305f\", item);\r\n      }\r\n      \r\n      Console.ReadKey();\r\n    }\r\n  }\r\n}<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">Osaka\u306f2\u756a\u76ee\u306b\u3042\u308a\u307e\u3059<\/pre>\n<h2>\u914d\u5217\u306e\u8981\u7d20\u3092\u691c\u7d22<\/h2>\n<p>\u914d\u5217\u306e\u8981\u7d20\u3092\u691c\u7d22\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u3082\u307f\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002IndexOf\u30e1\u30bd\u30c3\u30c9\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">public static int IndexOf(\r\n    Array array,\r\n    object value\r\n)<\/pre>\n<p>\u5f15\u6570array\u306f\u691c\u7d22\u5bfe\u8c61\u3068\u306a\u308b1\u6b21\u5143\u914d\u5217\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002\u5f15\u6570value\u306f\u691c\u7d22\u3059\u308b\u8981\u7d20\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002\u6307\u5b9a\u3057\u305f\u8981\u7d20\u304c\u898b\u3064\u304b\u3063\u305f\u5834\u5408\u306f\u30010\u304b\u3089\u59cb\u307e\u308b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u756a\u53f7\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n<p>\u898b\u3064\u304b\u3089\u306a\u304b\u3063\u305f\u5834\u5408\u306f-1\u3092\u8fd4\u3057\u307e\u3059\u3002\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u78ba\u8a8d\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"lang:c# decode:true \">using System;\r\n\r\nnamespace Sample\r\n{\r\n  class Sample\r\n  {\r\n    static void Main()\r\n    {\r\n      string[] src = {\"Tokyo\", \"Osaka\", \"Nagoya\"};\r\n      string item = \"Osaka\";\r\n      \r\n      int num = Array.IndexOf(src, item) + 1;\r\n      \r\n      if(num &gt; 0) {\r\n        Console.WriteLine(\"{0}\u306f{1}\u756a\u76ee\u306b\u3042\u308a\u307e\u3059\", item, num);  \r\n      } else {\r\n        Console.WriteLine(\"{0}\u306f\u898b\u3064\u304b\u308a\u307e\u305b\u3093\u3067\u3057\u305f\", item);\r\n      }\r\n      \r\n      Console.ReadKey();\r\n    }\r\n  }\r\n}<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">Osaka\u306f2\u756a\u76ee\u306b\u3042\u308a\u307e\u3059<\/pre>\n<h2>\u6587\u5b57\u5217\u5185\u306e\u8907\u6570\u306e\u8a72\u5f53\u7b87\u6240\u3092\u691c\u7d22<\/h2>\n<p>IndexOf\u30e1\u30bd\u30c3\u30c9\u3067\u306f\u691c\u7d22\u3057\u3066\u898b\u3064\u304b\u3063\u305f<b>\u6700\u521d\u306e\u4f4d\u7f6e<\/b>\u3092\u8fd4\u3057\u307e\u3059\u3002\u305d\u308c\u3067\u306f\u540c\u3058\u6587\u5b57\u3001\u6587\u5b57\u5217\u3001\u8981\u7d20\u304c\u8907\u6570\u542b\u307e\u308c\u3066\u3044\u3066\u3001\u305d\u306e\u5168\u3066\u306e\u4f4d\u7f6e\u3092\u53d6\u5f97\u3057\u305f\u3044\u5834\u5408\u306f\u3069\u306e\u3088\u3046\u306b\u3059\u308c\u3070\u3044\u3044\u3067\u3057\u3087\u3046\u304b\uff1f<\/p>\n<p>IndexOf\u30e1\u30bd\u30c3\u30c9\u306f\u5f15\u6570\u306e\u6307\u5b9a\u3067<b>\u691c\u7d22\u3092\u958b\u59cb\u3059\u308b\u4f4d\u7f6e\u3092\u6307\u5b9a<\/b>\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">public int IndexOf(\r\n    string value,\r\n    int startIndex\r\n)<\/pre>\n<p>\u5f15\u6570value\u306b\u306f\u691c\u7d22\u3059\u308b\u6587\u5b57\u5217\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002\u5f15\u6570startIndex\u306b\u306f\u691c\u7d22\u304c\u958b\u59cb\u3055\u308c\u308b\u4f4d\u7f6e\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002\u3053\u308c\u3092\u4f7f\u3063\u3066\u5168\u3066\u306e\u4f4d\u7f6e\u3092\u53d6\u5f97\u3059\u308b\u65b9\u6cd5\u3092\u3054\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"lang:c# decode:true \">using System;\r\n\r\nnamespace Sample\r\n{\r\n  class Sample\r\n  {\r\n    static void Main()\r\n    {\r\n      string str = \"Hello World!\";\r\n      string target = \"l\";\r\n      \r\n      int num = str.IndexOf(target);\r\n      \r\n      if(num &gt; 0) {\r\n        Console.WriteLine(\"{0}\u306f{1}\u756a\u76ee\u306b\u3042\u308a\u307e\u3059\", target, num + 1);\r\n        \r\n        \/\/ IndexOf\u30e1\u30bd\u30c3\u30c9\u3067\u898b\u3064\u304b\u3089\u306a\u304f\u306a\u308b\u307e\u3067\u7e70\u308a\u8fd4\u3059\r\n        while(num &gt; 0) {\r\n          \/\/\u898b\u3064\u304b\u3063\u305f\u4f4d\u7f6e\u306e\u6b21\u306e\u4f4d\u7f6e\u304b\u3089\u691c\u7d22\r\n          num = str.IndexOf(target, num + 1);\r\n          if(num &gt; 0) {\r\n            Console.WriteLine(\"{0}\u306f{1}\u756a\u76ee\u306b\u3042\u308a\u307e\u3059\", target, num + 1);\r\n          }\r\n        }\r\n      } else {\r\n        Console.WriteLine(\"{0}\u306f\u898b\u3064\u304b\u308a\u307e\u305b\u3093\u3067\u3057\u305f\", target);\r\n      }\r\n      \r\n      Console.ReadKey();\r\n    }\r\n  }\r\n}<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">l\u306f3\u756a\u76ee\u306b\u3042\u308a\u307e\u3059\r\nl\u306f4\u756a\u76ee\u306b\u3042\u308a\u307e\u3059\r\nl\u306f10\u756a\u76ee\u306b\u3042\u308a\u307e\u3059<\/pre>\n<p>\u3053\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u306f\u3001IndexOf\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u3066&#8221;Hello World!&#8221;\u304b\u3089&#8221;l&#8221;\u306e\u4f4d\u7f6e\u3092\u5168\u3066\u53d6\u5f97\u3057\u3066\u3044\u307e\u3059\u3002IndexOf\u30e1\u30bd\u30c3\u30c9\u306e\u7b2c2\u5f15\u6570\u3092\u898b\u3064\u304b\u3063\u305f\u4f4d\u7f6e\u306e\u6b21\u306e\u4f4d\u7f6e\u304b\u3089\u691c\u7d22\u3055\u308c\u308b\u3088\u3046\u306b\u6307\u5b9a\u3057\u3001while\u6587\u3092\u4f7f\u3063\u3066\u898b\u3064\u304b\u3089\u306a\u304f\u306a\u308b\u307e\u3067\u7e70\u308a\u8fd4\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<h2>\u5f8c\u308d\u304b\u3089\u306e\u691c\u7d22<\/h2>\n<p>IndexOf\u30e1\u30bd\u30c3\u30c9\u3067\u306f\u691c\u7d22\u3057\u3066\u898b\u3064\u304b\u3063\u305f\u6700\u521d\u306e\u4f4d\u7f6e\u3092\u8fd4\u3057\u307e\u3059\u3002\u305d\u308c\u3067\u306f\u5f8c\u308d\u304b\u3089\u691c\u7d22\u3057\u305f\u3044\u5834\u5408\u306f\u3069\u3046\u3059\u308c\u3070\u3044\u3044\u306e\u3067\u3057\u3087\u3046\u304b\uff1f<\/p>\n<p>\u305d\u306e\u3088\u3046\u306a\u5834\u5408\u306b\u306fLastIndexOf\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002LastIndexOf\u30e1\u30bd\u30c3\u30c9\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">public int LastIndexOf(\r\n    string value\r\n)<\/pre>\n<p>\u5f15\u6570value\u306b\u306f\u691c\u7d22\u3059\u308b\u6587\u5b57\u3001\u6587\u5b57\u5217\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002\u5f8c\u308d\u304b\u3089\u691c\u7d22\u3057\u3066\u6700\u521d\u306b\u898b\u3064\u304b\u3063\u305f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u756a\u53f7\u3092\u8fd4\u3057\u307e\u3059\u3002\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u78ba\u8a8d\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"lang:c# decode:true \">using System;\r\n\r\nnamespace Sample\r\n{\r\n  class Sample\r\n  {\r\n    static void Main()\r\n    {\r\n      string str = \"Hello World!\";\r\n      string target = \"l\";\r\n      \r\n      int num = str.LastIndexOf(target) + 1;\r\n      \r\n      if(num &gt; 0) {\r\n        Console.WriteLine(\"{0}\u306f{1}\u756a\u76ee\u306b\u3042\u308a\u307e\u3059\", target, num);  \r\n      } else {\r\n        Console.WriteLine(\"{0}\u306f\u898b\u3064\u304b\u308a\u307e\u305b\u3093\u3067\u3057\u305f\", target);\r\n      }\r\n      \r\n      Console.ReadKey();\r\n    }\r\n  }\r\n}<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">l\u306f10\u756a\u76ee\u306b\u3042\u308a\u307e\u3059<\/pre>\n<h2>\u6b63\u898f\u8868\u73fe\u3092\u4f7f\u3063\u305f\u691c\u7d22<\/h2>\n<p>\u6587\u5b57\u5217\u306b\u6b63\u898f\u8868\u73fe\u306b\u30de\u30c3\u30c1\u3059\u308b\u6587\u5b57\u5217\u304c\u542b\u307e\u308c\u3066\u3044\u308b\u304b\u691c\u7d22\u3057\u305f\u3044\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002\u6b63\u898f\u8868\u73fe\u3068\u306f\u3044\u304f\u3064\u304b\u306e\u6587\u5b57\u5217\u3092\u4e00\u3064\u306e\u5f62\u5f0f\u3067<b>\u307e\u3068\u3081\u3066\u8868\u73fe\u3059\u308b\u305f\u3081\u306e\u8868\u73fe\u65b9\u6cd5<\/b>\u306e\u3053\u3068\u3067\u3059\u3002\u4e3b\u306a\u6b63\u898f\u8868\u73fe\u306b\u3064\u3044\u3066\u306f\u4e0b\u8a18\u306e\u3068\u304a\u308a\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n<table id=\"tablepress-176\" class=\"tablepress tablepress-id-176 tbody-has-connected-cells\">\n<thead>\n<tr class=\"row-1\">\n\t<th class=\"column-1\">\u8a18\u53f7<\/th><th class=\"column-2\">\u8a18\u53f7\u306e\u8aac\u660e<\/th><th class=\"column-3\">\u4f8b<\/th><th class=\"column-4\">\u4f8b\u306e\u8aac\u660e<\/th>\n<\/tr>\n<\/thead>\n<tbody class=\"row-striping row-hover\">\n<tr class=\"row-2\">\n\t<td class=\"column-1\">.<\/td><td class=\"column-2\">\u4efb\u610f\u306e1\u6587\u5b57\u3002\u6539\u884c\u6587\u5b57\u306f\u9664\u304f\u3002<\/td><td class=\"column-3\">.+<\/td><td class=\"column-4\">\u4efb\u610f\u306e\u6587\u5b57\u5217<\/td>\n<\/tr>\n<tr class=\"row-3\">\n\t<td class=\"column-1\">*<\/td><td class=\"column-2\">\u76f4\u524d\u306e1\u6587\u5b57\u306e0\u56de\u4ee5\u4e0a\u306e\u7e70\u308a\u8fd4\u3057\u3068\u4e00\u81f4<\/td><td class=\"column-3\">hoge*<\/td><td class=\"column-4\">hoge\u3082\u3057\u304f\u306fhogee...\u3068\u4e00\u81f4<\/td>\n<\/tr>\n<tr class=\"row-4\">\n\t<td class=\"column-1\">^<\/td><td class=\"column-2\">\u884c\u306e\u5148\u982d<\/td><td class=\"column-3\">^[0-9]<\/td><td class=\"column-4\">\u884c\u982d\u304c\u6570\u5b57<\/td>\n<\/tr>\n<tr class=\"row-5\">\n\t<td class=\"column-1\">$<\/td><td class=\"column-2\">\u884c\u306e\u672b\u5c3e<\/td><td class=\"column-3\">^.{10}$<\/td><td class=\"column-4\">10\u6587\u5b57\u306e\u884c<\/td>\n<\/tr>\n<tr class=\"row-6\">\n\t<td class=\"column-1\">[ ]<\/td><td class=\"column-2\">\u30ab\u30c3\u30b3\u5185\u306e\u4efb\u610f\u306e1\u6587\u5b57\u3068\u4e00\u81f4\u3002\u300c-\u300d\u3067\u7bc4\u56f2\u6307\u5b9a\u53ef\u3002<\/td><td class=\"column-3\">[a-z]<\/td><td class=\"column-4\">\u5c0f\u6587\u5b57\u306e\u30a2\u30eb\u30d5\u30a1\u30d9\u30c3\u30c81\u6587\u5b57\u3068\u4e00\u81f4<\/td>\n<\/tr>\n<tr class=\"row-7\">\n\t<td class=\"column-1\">[^ ]<\/td><td class=\"column-2\">\u30ab\u30c3\u30b3\u5185\u306e\u4efb\u610f\u306e1\u6587\u5b57\u3068\u4e0d\u4e00\u81f4\u3002\u300c-\u300d\u3067\u7bc4\u56f2\u6307\u5b9a\u53ef\u3002<\/td><td class=\"column-3\">[^A-Z]<\/td><td class=\"column-4\">\u5927\u6587\u5b57\u306e\u30a2\u30eb\u30d5\u30a1\u30d9\u30c3\u30c8\u4ee5\u5916<\/td>\n<\/tr>\n<tr class=\"row-8\">\n\t<td class=\"column-1\">+<\/td><td class=\"column-2\">\u76f4\u524d\u306e\u6587\u5b57\u306e1\u500b\u4ee5\u4e0a\u306e\u7e70\u308a\u8fd4\u3057\u3068\u4e00\u81f4<\/td><td class=\"column-3\">hoge+<\/td><td class=\"column-4\">hogee...\u3068\u4e00\u81f4<\/td>\n<\/tr>\n<tr class=\"row-9\">\n\t<td class=\"column-1\">?<\/td><td class=\"column-2\">\u76f4\u524d\u306e\u6587\u5b57\u306e0\u307e\u305f\u306f1\u6587\u5b57\u3068\u4e00\u81f4<\/td><td class=\"column-3\">hoge?<\/td><td class=\"column-4\">e\u3068\u4e00\u81f4<\/td>\n<\/tr>\n<tr class=\"row-10\">\n\t<td rowspan=\"4\" class=\"column-1\">{ }<\/td><td rowspan=\"4\" class=\"column-2\">\u30ab\u30c3\u30b3\u5185\u306e\u6570\u5024\u306e\u7e70\u308a\u8fd4\u3057\u3068\u4e00\u81f4<\/td><td class=\"column-3\">{n}<\/td><td class=\"column-4\">\u76f4\u524d\u306e\u6587\u5b57\u306en\u500b\u306e\u7e70\u308a\u8fd4\u3057\u3068\u4e00\u81f4<\/td>\n<\/tr>\n<tr class=\"row-11\">\n\t<td class=\"column-3\">{,n}<\/td><td class=\"column-4\">\u76f4\u524d\u306e\u6587\u5b57\u306en\u500b\u4ee5\u4e0b\u306e\u7e70\u308a\u8fd4\u3057\u3068\u4e00\u81f4<\/td>\n<\/tr>\n<tr class=\"row-12\">\n\t<td class=\"column-3\">{m,}<\/td><td class=\"column-4\">\u76f4\u524d\u306e\u6587\u5b57\u306em\u500b\u4ee5\u4e0a\u306e\u7e70\u308a\u8fd4\u3057\u3068\u4e00\u81f4<\/td>\n<\/tr>\n<tr class=\"row-13\">\n\t<td class=\"column-3\">{m,n}<\/td><td class=\"column-4\">\u76f4\u524d\u306e\u6587\u5b57\u306em\u500b\u4ee5\u4e0a\u3001n\u500b\u4ee5\u4e0b\u306e\u7e70\u308a\u8fd4\u3057\u3068\u4e00\u81f4<\/td>\n<\/tr>\n<tr class=\"row-14\">\n\t<td class=\"column-1\">|<\/td><td class=\"column-2\">\u76f4\u524d\u3001\u76f4\u5f8c\u3069\u3061\u3089\u304b\u306e\u30d1\u30bf\u30fc\u30f3\u306b\u4e00\u81f4<\/td><td class=\"column-3\">hoge|piyo<\/td><td class=\"column-4\">hoge\u307e\u305f\u306fpiyo<\/td>\n<\/tr>\n<tr class=\"row-15\">\n\t<td class=\"column-1\">( )<\/td><td class=\"column-2\">\u30ab\u30c3\u30b3\u5185\u3092\u30b0\u30eb\u30fc\u30d7\u5316\u3002\u30de\u30c3\u30c1\u3057\u305f\u5185\u5bb9\u306f\u53c2\u7167\u53ef\u3002<\/td><td class=\"column-3\">\u30fc<\/td><td class=\"column-4\">\u30fc<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<!-- #tablepress-176 from cache -->\n<p>C#\u3067\u6b63\u898f\u8868\u73fe\u306b\u30de\u30c3\u30c1\u3059\u308b\u6587\u5b57\u5217\u304c\u542b\u307e\u308c\u3066\u3044\u308b\u304b\u691c\u7d22\u3059\u308b\u306b\u306f\u3001S<b>ystem.Text.RegularExpressions.Regex\u30af\u30e9\u30b9<\/b>\u3092\u4f7f\u3044\u307e\u3059\u3002<\/p>\n<p>\u7528\u610f\u3055\u308c\u3066\u3044\u308b\u30e1\u30bd\u30c3\u30c9\u306b\u306f\u3001\u6307\u5b9a\u3057\u305f\u6b63\u898f\u8868\u73fe\u304c\u542b\u307e\u308c\u3066\u3044\u308b\u304b\u78ba\u8a8d\u3059\u308b\u305f\u3081\u306eIsMatch\u30e1\u30bd\u30c3\u30c9\u3084\u691c\u7d22\u3059\u308b\u305f\u3081\u306eMatches\u30e1\u30bd\u30c3\u30c9\u306a\u3069\u304c\u3042\u308a\u307e\u3059\u3002Regex\u30af\u30e9\u30b9\u306e\u7c21\u5358\u306a\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066\u3001\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u3054\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"lang:c# decode:true \">using System;\r\nusing System.Text.RegularExpressions;\r\n\r\nnamespace Sample\r\n{\r\n  class Sample\r\n  {\r\n    static void Main()\r\n    {\r\n      string str = \"\u4f8d\u30a8\u30f3\u30b8\u30cb\u30a2\";\r\n      string target = \"[\u30a8\u30f3\u30b8\u30cb\u30a2]\";\r\n      \r\n      if(Regex.IsMatch(str, target)) {\r\n        MatchCollection mc = Regex.Matches(str, target);\r\n        foreach(Match m in mc) {\r\n          Console.WriteLine(\"{0}\u306f{1}\u756a\u76ee\u306b\u3042\u308a\u307e\u3059\", m.Value, m.Index + 1);\r\n        }\r\n      } else {\r\n        Console.WriteLine(\"{0}\u306f\u898b\u3064\u304b\u308a\u307e\u305b\u3093\u3067\u3057\u305f\", target);\r\n      }\r\n      \r\n      Console.ReadKey();\r\n    }\r\n  }\r\n}<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">\u30a8\u306f2\u756a\u76ee\u306b\u3042\u308a\u307e\u3059\r\n\u30f3\u306f3\u756a\u76ee\u306b\u3042\u308a\u307e\u3059\r\n\u30b8\u306f4\u756a\u76ee\u306b\u3042\u308a\u307e\u3059\r\n\u30cb\u306f5\u756a\u76ee\u306b\u3042\u308a\u307e\u3059\r\n\u30a2\u306f6\u756a\u76ee\u306b\u3042\u308a\u307e\u3059<\/pre>\n<p>\u3053\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u306f\u3001RegularExpressions\u30af\u30e9\u30b9\u3092\u4f7f\u3063\u3066\u6b63\u898f\u8868\u73fe\u3067\u691c\u7d22\u3057\u3066\u3044\u307e\u3059\u3002\u6b63\u898f\u8868\u73fe\u30d1\u30bf\u30fc\u30f3\u306b\u306f\u201d\u30a8\u201d\u3001\u201d\u30f3\u201d\u3001\u201d\u30b8\u201d\u3001\u201d\u30cb\u201d\u3001\u201d\u30a2\u201d\u306e\u3044\u305a\u308c\u304b\u306e\u6587\u5b57\u3092\u6307\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>IsMach\u30e1\u30bd\u30c3\u30c9\u3067\u6307\u5b9a\u3057\u305f\u6b63\u898f\u8868\u73fe\u30d1\u30bf\u30fc\u30f3\u304c\u542b\u307e\u308c\u308b\u304b\u78ba\u8a8d\u3092\u884c\u3044\u3001Maches\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u3066\u6587\u5b57\u5217str\u5185\u306e\u5168\u3066\u306e\u6587\u5b57\u306b\u5bfe\u3057\u3066\u30de\u30c3\u30c1\u30f3\u30b0\u3092\u884c\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>Maches\u30e1\u30bd\u30c3\u30c9\u306e\u623b\u308a\u5024\u306fMatchCollection\u30af\u30e9\u30b9\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8mc\u306b\u683c\u7d0d\u3055\u308c\u3001foreach\u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u3092\u4f7f\u3063\u3066\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\uff11\u3064\u305a\u3064\u306b\u30a2\u30af\u30bb\u30b9\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>Match\u30af\u30e9\u30b9\u306e\u30d7\u30ed\u30d1\u30c6\u30a3Value\u304a\u3088\u3073Index\u3092\u4f7f\u3063\u3066\u3001<b>\u30de\u30c3\u30c1\u30f3\u30b0\u3057\u305f\u6587\u5b57\u5217\u3068\u4f4d\u7f6e\u3092\u305d\u308c\u305e\u308c\u53d6\u5f97<\/b>\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<h2>\u307e\u3068\u3081<\/h2>\n<p>\u3053\u3053\u3067\u306f\u3001IndexOf\u30e1\u30bd\u30c3\u30c9\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3057\u305f\u3002IndexOf\u30e1\u30bd\u30c3\u30c9\u306f\u6587\u5b57\u5217\u5185\u306b\u542b\u307e\u308c\u308b\u6587\u5b57\u3001\u6587\u5b57\u5217\u306e\u4f4d\u7f6e\u3092\u53d6\u5f97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u307e\u305f\u3001List\u3084\u914d\u5217\u306b\u542b\u307e\u308c\u308b\u8981\u7d20\u306e<b>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u756a\u53f7\u3092\u53d6\u5f97<\/b>\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u4f7f\u3044\u3053\u306a\u3059\u3053\u3068\u304c\u3067\u304d\u308b\u3088\u3046\u306b\u3001\u3053\u306e\u8a18\u4e8b\u3092\u4f55\u5ea6\u3082\u53c2\u8003\u306b\u3057\u3066\u4e0b\u3055\u3044\u306d\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>IndexOf\u3063\u3066\u4f7f\u3063\u3066\u3044\u307e\u3059\u304b\uff1fC#\u3067\u306f\u6587\u5b57\u5217\u3084\u914d\u5217\u3001List\u304b\u3089\u6307\u5b9a\u3057\u305f\u5bfe\u8c61\u3092\u691c\u7d22\u3057\u3001\u305d\u306e\u4f4d\u7f6e\u3092\u53d6\u5f97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001IndexOf\u306b\u3064\u3044\u3066 IndexOf\u30e1\u30bd\u30c3\u30c9\u3068\u306f \u6587\u5b57\u5217\u5185\u306e\u6587\u5b57\u3092\u691c\u7d22 List [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":41738,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"swell_btn_cv_data":"","footnotes":""},"categories":[2334],"tags":[71],"class_list":["post-41736","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-c-sharp-study","tag-c"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u3010C#\u5165\u9580\u3011IndexOf\u3067\u6587\u5b57\u5217\u3084List\u3001\u914d\u5217\u3092\u691c\u7d22\u3059\u308b\u65b9\u6cd5 | \u4f8d\u30a8\u30f3\u30b8\u30cb\u30a2\u30d6\u30ed\u30b0<\/title>\n<meta name=\"description\" content=\"\u3053\u306e\u8a18\u4e8b\u3067\u306f\u300c 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content=\"https:\/\/www.sejuku.net\/blog\/41736\" \/>\n<meta property=\"og:site_name\" content=\"\u4f8d\u30a8\u30f3\u30b8\u30cb\u30a2\u30d6\u30ed\u30b0\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/sejuku2013\" \/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/sejuku2013\/\" \/>\n<meta property=\"article:published_time\" content=\"2018-01-09T06:50:31+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-05-06T02:45:46+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/01\/C_IndexOf.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"700\" \/>\n\t<meta property=\"og:image:height\" content=\"400\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"\u4f8d\u30a8\u30f3\u30b8\u30cb\u30a2\u7de8\u96c6\u90e8\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta 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